Method of making u-shaped pipe-bends.



J. KINDERVATER.

METHOD OF MAKING U-SHAPED PIPE BENDS.

APPLICATION FILED JULY 8. 1914.

1 1 37,267. Patented Apr. 27, 1915.

WI Til/E8858 IN VEN TOR A TTORNEYS UNITED STATES PATENT OFFICE.

JULIUS KINDFRVATER. OF RICHMOND, VIRGINIA, ASSIGNOR TO LOCOMOTIVE SUPER-HEATER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE,

METHOD OF MAKING U-SHAPED PIPE-BENDS.

Specification of Letters Patent.

Patented Apr. 27, 1915.

Application filed July 8, 1914. Serial No. 849,676.

To all 'u'Im-m it may com-(I'll lle it known that l, Jumus Kmnnuv/vrnu,a citizen of the United States. and a resident of Richmond, county ofllenrico, State of Virginia, have invented a certain new and usefullinprovement in Methods of Making U-Shaped Pipe-Bends, of which thefollowing is :1V specification.

My invention concerns the making of U shaped pipe bends and particularlysuch bends when used in connection with boilers, superhcatcrs and,generally, when exposed to high teim'ieraturcs or used to carry steam orfluid under pressure. My invention may, however, be utilized toadvantage in making pipe bends of the class referred to even though suchpressure and temperature conditions are absent.

Various ways of making bends of the above character for similar purposeshave been proposed.

The present invention comprises a method which, as contrasted with knownmethods, is of extreme simplicity, does not involve special tools ordies, can be carried out by comparatively unskilled workmen, and mvolvesvery little Waste of material.

The object of my invention is to prov de a pipe bend of the characterspecified which may be simply, easily and economically manufactured asaforesaid, which shall not involve any undue stretching, thinning, orstraining of the pipe walls at any point, and which shall be adapted toWithstand high pressures and temperatures when used under such highpressure and high temperature conditions.

My invention will be better understood by referring to the drawings, inwhieh- Figure 1 represents a plan view showing two pipes (broken away)united by a pipe made according to a preferred mode of carrying out myinvention; Fig. 2 represents a central section taken along the line 22of Fig. 1; Fig. 3 represents a plan view of a piece of pipe showing howthe connecting members are formed; and Fig. 4 represents a section,taken along the line 4-4 of Fig. 3, through one of said connectingmembers.

Referring to the drawings, pipe lengths 1 and 2. which are to be unitedby the U shaped bend 3, have their ends independently squared off alongplanes 4, 4; each of said ends is also beveled off along a plane 5,

which plane must intersect, at plane 4, an

axial plane of the pipe length. From another piece of pipe 6, having thesame diameter and wall thickness as pipes 1 and 2, is cut a connectingmember 7. This member is preferably obtained by slitting the pipe fromthe sidealong two planes 8 and 9. These planes should include an angleof 90 and each plane should make an angle of 45 with the axis of thepipe. The slits extend to the center of the pipe e., to an axial plane).The distance 10, between the points 11 at which the slits enter the sideof the pipe, determines the distance between adjacent walls of the pipewhen the pipe bend is completed.

Slitting the pipe in the axial plane 12 to which the slits 8 and 9extend will complete the formation of the connecting member 7. Insteadof first slitting in the planes 8 and 9 and then slitting in the plane12 the connecting member may be formed by first slitting in the plane 12and then in the planes 8 and 9. In the claims the piece of pipe outalong the plane 12 is called a half-pipe. A minimum of waste will occurif slits 8' and 9' corresponding to 8, 9 be made from the opposite sideof the pipe, as shown in the drawing, thus providing material for twoconnecting members 7 which may then be separated from one another byslitting along the line 12.

The two pipe lengths, 1 and 2, are then placed parallel to one anotherwith beveled portions adjacent and then the connecting member insertedbetween them with its edges abutting the beveled edges of the pipe ends;the pipe lengths 1 and 2 and pipe section 6 from which the connectingmember 7 has been formed, all being of the same diameter and wallthickness, said edges will accurately abut, so that these edges may thenbe welded together in any desired manner, preferably electrically.

The pipe end is completed by applying a cap 13, preferably drop-forged.For use in superheaters, which is the use I have particularlycontemplated in making this invention, I prefer the forging to be sodone that the cap has a somewhat sharpened section across the plane ofthe pipe bend. The cap also should gradually increase in thickness or bereinforced, as it is commonly described toward its end. The cap may haveany desired depth thus furnishing as-great an internal cross-section atthe bend as may be wished for.

Instead of beveling the pipe ends at and so as to intersect the axialplane of the pipe at the open end of the pipe, the plane of the bevelsmay have any other desired angle. In such case, if said bevels intersectthe axial plane of the pipe at the open end of the pipe the connectingmember will be a half pipe cut from an elliptical sectioned pipe insteadof from a pipe of circular section. If the bevels do not intersect theaxial plane of the pipe at the open end of the pipe, then the connectingmember will be, as before, cut from an elliptically sectioned pipe butits lane 12 will not be a central plane but a p ane lying nearer the oneextremity or the other of the major axis of the ellipse.

Having described my invention, I claim:

1. The method of making U-shaped pipe bends which comprises squaring andbeveling off the ends of two pipes, providing a segment of pipe havingends beveled at angles corresponding to those of the bevels on the twopipes, inserting said segment between the two pipes, with its endsrespectively abutting the beveled portions of said pipes, welding theedges of the pipe ends and segments together, and welding the edges of acap to the remaining edges of the pipe ends and segments.

2. The method of making U-shaped pipe bends which comprises squaring andbeveling oil the ends of two pipes, so as to intersect the axial planeof the pipe in the open end of said ipe; providing a segment of halfpipe having ends beveled at angles corresponding to those of the bevelson the two pipes, inserting said segment between the two pipes, with itsends respectively abutting the beveled portions of said pipes, weldingthe edges of the pipe ends and segments together, and welding the edgesof a cap to the remaining edges of the pipe ends and segments.

3. The method of making U-shaped pipe bends which comprises squaring andbeveling off the ends of two pipes each bevel being at 45 with an axialplane which it intersects at the open end of the pipe, providing asegment of half pipe of the same diameter and wall thickness as the twopipes and having similar and symmetric ends beveled at the same angle asare the two pipes, inserting said segment between the two pipes with itsends respectively abutting the beveled portions of said pipes, weldingthe edges of pipe ends and segment together, and welding the edges of acap to the remaining edges of the pipe ends and segment.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JULIUS KINDERVATER. Witnesses:

J N0. S. AGNEW, L. E. DINGMAN.

